[1] Univ Texas SW Med Ctr Dallas, Dept Psychiat, Dallas, TX 75390 USA
[2] Univ Georgia, Dept Psychol, BioImaging Res Ctr, Athens, GA 30602 USA
[3] Univ Georgia, BioImaging Res Ctr, Dept Neurosci, Athens, GA 30602 USA
[4] Inst Living, Olin Neuropsychiat Res Ctr, Hartford, CT USA
[5] Yale Univ, Sch Med, Dept Psychiat, New Haven, CT USA
[6] Yale Univ, Sch Med, Dept Neurobiol, New Haven, CT USA
[7] Harvard Univ, Beth Israel Deaconess Med Ctr, Dept Psychiat, Boston, MA 02215 USA